This rock is rounded as owner didn't want sharp edges due to kids playing at this corner. So made it to look like an eroded sedimentary rock.

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Comment by SCOTT ARMSTRONG on June 14, 2012 at 2:50pm

FYI: Mix was simply 2 parts fine playsand, 1 part portland, 1/3 part lime, about half cup of acrylic polymer to each 5 gallon bucket. Mixed until the material was whipped up (I'd say less dense than peanut butter). No retarders even though it was 100 degrees out by 2:00 pm.

Comment by SCOTT ARMSTRONG on June 14, 2012 at 4:12pm

FYI2: I picked up a bag of white "line" marking dust/chalk at Home Depot. This is the stuff sold for marking the boundaries of soccer and baseball fields in 50 lb bags. This I determined is comprised of very fine, silt sized particles of ground limestone (not chalk). Not as fine as talc powder and does not make a sticky paste like actual chalk would. This worked great as a CHEAP release agent and stayed embedded into the surface to a nice degree like powder release. First I used odor-free mineral spirits liberally on the carve coat. After reliefing I through on the white line marking chalk and textured the carved out portions. Easy to clean up afterwards since it is more granular than a dust.

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